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+Module for working with strings.
+PROCEDURE Length (str: ARRAY OF CHAR): INTEGER;
+Returns the number of characters in s up to and excluding the first 0X.
+PROCEDURE Insert (source: ARRAY OF CHAR; pos: INTEGER; VAR dest: ARRAY OF CHAR);
+Inserts the string 'source' into the string 'dst' at position
+'pos' (0 <= pos <= Length(dst)). If pos = Length(dst), 'source' is appended to 'dst'.
+If the size of 'dst' is not large enough to hold the result of the operation,
+the result is truncated so that 'dst' is always terminated with 0X.
+PROCEDURE Append (str2: ARRAY OF CHAR; VAR str1: ARRAY OF CHAR);
+Has the same effect as Insert(s, Length(dst), dst)
+PROCEDURE Delete (VAR s: ARRAY OF CHAR; pos, n: INTEGER);
+Deletes 'n' characters from 's' starting at position 'pos'
+(0 <= pos Length(s)). If n > Length(s) - pos, the new length of 's' is 'pos'.
+PROCEDURE Replace (source: ARRAY OF CHAR; pos: INTEGER; VAR dest: ARRAY OF CHAR);
+Has the same effect as Delete(dst, pos, Length(src)) followed by an Insert(src, pos, dst).
+PROCEDURE Extract (source: ARRAY OF CHAR; pos, n: INTEGER; VAR dest: ARRAY OF CHAR);
+Extracts a substring 'dst' with 'n' characters from position 'pos'
+(0 <=pos Length(src)) in 'src'. If n > Length(src) - pos, 'dst' is only
+the part of 'src' from 'pos' to the end of 'src', i.e. Length(src) -1.
+If the size of 'dst' is not large enough to hold the result of the operation,
+the result is truncated so that 'dst' is always terminated with a 0X.
+PROCEDURE Pos (pattern, s: ARRAY OF CHAR; pos: INTEGER): INTEGER;
+Returns the position of the first occurrence of 'pat' in 's'.
+Searching starts at position 'pos'. If 'pat' is not found, -1 is returned.
+(* conversion functions *)
+PROCEDURE IntToString (arg: INTEGER; VAR res: ARRAY OF CHAR);
+Represents the integer 'arg' as the string 'res'.
+PROCEDURE RealToString (arg: REAL; VAR res: ARRAY OF CHAR);
+Represents the real number 'arg' as the string 'res'.
+PROCEDURE RealToStringFixed (arg: REAL; VAR res: ARRAY OF CHAR; fixed: INTEGER);
+Represents the real number 'arg' as the string 'res' with the number of 'fixed' decimal characters.
+PROCEDURE StringToInt (arg: ARRAY OF CHAR; VAR out: INTEGER): BOOLEAN;
+Converts a string to an integer.
+PROCEDURE StringToReal (arg: ARRAY OF CHAR; VAR out: REAL): BOOLEAN;
+Converts a string to a real number.

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